Multicomponent Organic Metal Halide Hybrid with White Emissions

Abstract

Zero‐dimensional (0D) organic metal halide hybrids, in which organic and metal halide ions cocrystallize to form neutral species, are a promising platform for the development of multifunctional crystalline materials. Herein we report the design, synthesis, and characterization of a ternary 0D organic metal halide hybrid, (HMTA)4PbMn0.69Sn0.31Br8, in which the organic cation N‐benzylhexamethylenetetrammonium (HMTA+, C13H19N4+) cocrystallizes with PbBr42−, MnBr42−, and SnBr42−. The wide band gap of the organic cation and distinct optical characteristics of the three metal bromide anions enabled the single‐crystalline “host–guest” system to exhibit emissions from multiple “guest” metal halide species simultaneously. The combination of these emissions led to near‐perfect white emission with a photoluminescence quantum efficiency of around 73 %. Owing to distinct excitations of the three metal halide species, warm‐ to cool‐white emissions could be generated by controlling the excitation wavelength.

Indium-antimony-halide single crystals for high-efficiency white-light emission and anti-counterfeiting

“…Three-dimensional (3D) organic-inorganic lead halide perovskites have gained tremendous attention due to their unique optical and electronic properties, such as high absorption coefficiency, easily tunable bandgaps, high charge carrier mobility, and exceptional defect tolerance, which further enable their successful implementation in solar cells, photodetectors, and light-emitting diodes (LEDs) (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12). Very recently, low-dimensional lead halide perovskites have emerged as single-phase white-emitting materials due to their intriguing broadband emission behavior, which has been highlighted with excellent color stability and can efficiently avert self-absorption issues faced by the currently commercial multicomponent-based white-light sources (13)(14)(15)(16)(17)(18)(19)(20).…”

Regulation strategy of white emission from organic–inorganic hybrid metal halide perovskites

“…Since the optical properties of perovskites (ABX 3 ) are closely related to their composition, structure and external environment, the white-light performance (such as Φ, CIE, CRI and CCT) can be adjusted by changing the organic cations at the A-site, metal ions at the B-site, halogen anions at the X-site, spatial dimension, excitation wavelengths, and external stimuli (light, force, heat, etc.). White-light emissions with Φ up to 100%, 42 CRI up to 97, 43 and CIE of (0.32, 0.33) 96 have been achieved through the regulation of the white emission of OIHPs.…”

“…17a). 96 The (HMTA) 4 PbMn 0.69 Sn 0.31 Br 8 can achieve white light emission with a Φ of 73%. There are three emission peaks at 460 nm, 550 nm and 645 nm in the photoluminescence spectrum of the OIHP excited at 296 nm (Fig.…”

Antimony -doped indium-based halide single crystals enabling white-light emission

“…34 Ma and coworkers reported (HMTA) 4 PbMn 0.69 Sn 0.31 Br 8 co-crystals with multiple metal halide cations, exhibiting a near-perfect white light emission with CIE coordinates of (0.32, 0.33) and high photoluminescence quantum efficiency (PLQE) of ∼73%. 35 Despite excellent progress on white light emission being achieved, the toxicity of lead dramatically restricts further investigation and applications. Therefore, the exploration of white light emission in low dimensional lead-free metal halides is extremely desirable.…”